Brisk walks are the best way to burn off all those festive calories, especially during lockdown when keep fit options are limited. Timing is everything at this time of year. The distant sun is low on the horizon and, at its height, peeps only briefly above the tree line. A midday stroll is best, crunching through the frost, bubble-wrapped against the winds that blow across the East Anglian flatlands. Then it’s back to the cottage to put all those calories back on again.